WO2013012115A1

WO2013012115A1 - Energy recovery apparatus in a desalination system using reverse osmosis

Info

Publication number: WO2013012115A1
Application number: PCT/KR2011/005526
Authority: WO
Inventors: 정기철; 전상규; 강만곤; 권순광; 최현철
Original assignee: 효성굿스프링스 주식회사
Priority date: 2011-07-20
Filing date: 2011-07-27
Publication date: 2013-01-24
Also published as: KR20130011197A; KR101306401B1

Abstract

The present invention relates to an energy recovery apparatus in a desalination system using reverse osmosis, which consists essentially of: a reverse osmosis module (3); a pair of power recovery chambers (5); and a passage switching valve (7). The passage switching valve (7) is made of one or more inlets (31) into which a high pressure fluid flows, at least one pair of outlets (33 and 34) for alternatingly discharging fluid from the inside, and at least one pair of drain holes (35 and 36) for alternatingly draining fluid from the inside, and consists essentially of: a tube body (30) having intake or drain sheet portions (37-1, 37-2, 37-3, and 37-4) each projecting adjacent to one another on an inner periphery thereof between the inlets (31), the outlets (33 and 34), and the drain holes (35 and 36); an actuating rod (50) having an intake or drain catching means (53-1, 53-2, 53-3, and 53-4) projecting on an outer periphery thereof so as to correspond to the sheet portions (37-1,37-2,37-3, and 37-4) on a one-to-one basis; and a plurality of intake or drain valve bodies (70-1, 70-2, 70-3, and 70-4) for blocking the flow of the fluid through the sheet portions (37-1, 37-2, 37-3, and 37-4). Accordingly, the opening and closing operation of the valves can be simultaneously controlled using one actuating rod and an actuator, so that equipment and operating costs can be dramatically reduced, and since high pressure concentrated water is not directly drained into a drain tank during the valve operation, the recovery rate of pressure energy can be dramatically increased.

Description

Energy recovery system of desalination system using reverse osmosis

The present invention relates to an energy recovery apparatus of a desalination system using reverse osmosis, and more particularly, to pressurize seawater against a membrane to remove salts by reverse osmosis in a system for desalination of seawater using reverse osmosis. The present invention relates to an energy recovery apparatus of a desalination system using reverse osmosis that recovers energy used for pressurization by pressurizing low pressure raw water with the remaining pressure used.

In general, the flow path switching valve used in the energy recovery device and the like is applied to various types of valve body as a means for opening and closing the flow path, one example of the spool type of the linear spool valve device disclosed in US Patent No. 5,797,37-49 Control valves.

As shown in FIG. 1, the spool-type control valve device is capable of cross-feeding high-pressure seawater or brine to the high-pressure vessel 105 as the spool-type piston 103 moves. It is characterized by a structure.

However, such a conventional control valve device 101 is a high-pressure vessel 105 to the operating fluid inside the cylinder 107, that is, sea water or water by the spool-type piston 103 reciprocating inside the sleeve-type cylinder 107 In order to allow the piston 103 to slide smoothly in the cylinder 107 when the working fluid is a fluid having little viscosity such as seawater or water, the inner peripheral surface of the cylinder 107 There was a problem in that leakage of the working fluid between the piston 103 outer circumferential surface could not be avoided.

In order to solve this problem, a three-way poppet valve disclosed in US Pat. No. 7,540,230 has been proposed, which uses a poppet-shaped control valve to minimize the leakage between the cylinder and the piston. Energy efficiency can be increased by eliminating, but since a plurality of poppet valves are used, a plurality of corresponding actuators must be used, and each actuator must be controlled separately, which complicates the overall structure or control, and thus the equipment and maintenance. There was a problem that the cost of such an increase.

As another example, a rotary control valve other than the above-mentioned reciprocating control valve is proposed in US Pat. No. 7,600,535. In this patent, an external power is used to rotate an inner rotor to open and close a casing and a rotor flow path, thereby desired system response. However, since the rotary control valve is required to maintain a constant gap between the rotor and the casing, the leakage between the gaps is inevitable, and thus there is a problem that the system efficiency is lowered due to such leakage.

The present invention has been made to solve the problems of the conventional flow path switching valve as described above, in the energy recovery device of the desalination system having a flow path switching valve to open and close the valve as a working fluid seawater such as high pressure concentrated water or low pressure source water The purpose is to improve the flow path switching performance of the valve by minimizing the leakage of the valve body for switching the flow path inside the valve pipe when the flow.

In addition, by carrying out the opening and closing operation of the valve body by a single operation means to greatly simplify the structure of the entire system to which the valve is applied, and to further reduce the cost required for installation and maintenance have.

In addition, it is another object to improve the recovery rate of the pressure energy by minimizing the loss of pressure energy of the high pressure concentrated water by optimizing the arrangement or shape of the valve body in the valve body.

In order to achieve the above object, the present invention is a reverse osmosis module for producing a treated water from which the salt is removed by separating a portion of the sea water supplied to a high pressure in the high pressure water tank by the membrane to the ionic material and pure water; Is installed between the reverse osmosis module and the high pressure water tank, the at least one pair of the pressure of the remaining high pressure concentrated water reverse osmosis in the reverse osmosis module is transmitted to the low pressure seawater supplied from the low pressure water tank to the high pressure water tank Power recovery chamber; And a flow path switching valve installed between the reverse osmosis module and the power recovery chamber and alternately supplying the high pressure concentrated water discharged from the reverse osmosis module to each of the power recovery chambers. The valve may include at least one inlet connected to a high pressure fluid source to allow the high pressure fluid to flow therein, at least one pair of outlets each formed at each side of the inlet to alternately discharge the internal fluid, and at both ends. At least one pair of drain holes respectively formed to alternately drain the fluid therein, each of the inlets, outlets, and drain holes adjacent to each other adjacent to the inner circumferential surface of the pipe body protruding from each other; An actuating rod mounted in the tubular body so as to be able to move back and forth in the axial direction by an actuating means, the actuating rod having a suction or drainage catching means protruding one-to-one on the outer circumferential surface thereof; And a plurality of suction or drain valve bodies mounted on an outer circumferential surface of the working rod and configured to control the flow of fluid through the seat unit by repeating detachment with the seat unit corresponding to one to one. Provide an energy recovery device of the desalination system.

Further, any one of the suction catching means having the inlet interposed therebetween corresponds to one of the suction seats with the inlet interposed with the corresponding one of the suction valve bodies with the inlet interposed therebetween. When the inlet is cut off from the inlet and the flow from the one inlet valve body to the corresponding one outlet stops, the other suction catching means is connected to the corresponding other intake valve. A sieve is spaced apart from the corresponding other suction seat portion such that a flow from the inlet to the other outlet is connected, the one of said drainage catching means between said outlet and said drainage outlet. The means corresponds to any one of the drain valve body between the outlet and the drain port, among the drain seat portions between the outlet and the drain port. Is formed at a position such that the flow from one of the corresponding outlets to the corresponding one of the drains is connected to one of the drains so as to be spaced apart from each other; Preferably, the one drain valve body is brought into close contact with the corresponding other drain seat and the position is such that the flow from the other outlet to the corresponding other drain port is cut off.

In addition, the other drainage catching means is such that the other drain valve body is in close contact with the corresponding other drain seat portion before the other suction valve body is separated from the corresponding other suction seat portion. It is preferable that it is formed in the position.

The one of the drain valves may be configured to contact the one of the suction seats with one of the suction valves, and then the one of the drain valves may correspond to the one of the suction seats. A sieve is formed at a position to be spaced apart from the corresponding one of the drain seats, wherein either one of the suction valve bodies has one of the drain catching means draining the one of the drain valve bodies, In close contact with either of the suction seat portions before being separated from the seat portion, the flow from the inlet to the one drain hole continues while the one drain valve body is spaced from the one drain seat portion. It is desirable to be disconnected.

Further, it is preferable that each of the suction valve bodies is fixed on the surface facing the inlet of the corresponding respective suction catching means.

The suction valve body may include: a poppet part fixed coaxially to the operation rod and having an outer diameter greater than an inner diameter of the suction seat part; A spool portion protruding from the poppet portion toward the suction seat portion, the spool portion being secured to a length sufficient to be in close contact with the suction seat portion before the drainage catching means is spaced apart from the drainage seat portion; And a guide portion protruding radially from the spool portion at a predetermined interval from the suction sheet portion to maintain the insertion state in the suction sheet portion even at the maximum opening position.

1 is a longitudinal sectional view showing a conventional flow path switching valve.

Figure 2 is a schematic cross-sectional view showing an energy recovery device of the desalination system using a reverse osmosis according to an embodiment of the present invention.

3 is a longitudinal sectional view showing a state in which an operating rod of the flow path switching valve shown in FIG.

FIG. 4 is a view showing a state in which the left drain valve body of the flow path switching valve shown in FIG. 2 is in close contact with the left drain seat portion; FIG.

FIG. 5 is a view showing a neutral state in which an actuating rod of the flow path switching valve shown in FIG. 2 is located at the center of the valve body.

FIG. 6 is a view showing a state in which the right suction valve body of the flow path switching valve shown in FIG. 2 starts to seal the right suction seat. FIG.

FIG. 7 is a longitudinal sectional view showing a state in which an operating rod of the flow path switching valve shown in FIG. 2 is located at a left dead center; FIG.

FIG. 8 is a view showing a state in which the right drain valve body of the flow path switching valve shown in FIG. 2 is in close contact with the right drain seat portion; FIG.

FIG. 9 is a view showing a state in which the left suction valve body of the flow path switching valve shown in FIG. 2 starts to seal the left suction seat.

10 is an enlarged cross-sectional view showing a state in which the suction valve body and the suction catching means shown in FIGS. 2 to 9 are fastened by bolts.

11 is a perspective view of the valve body shown in FIGS. 2 to 10.

* Explanation of Codes *

1: Energy recovery device of desalination system using reverse osmosis

3: reverse osmosis module 5, 6: power recovery chamber

7: flow path switching valve 8: membrane

9: high pressure water tank 10: low pressure water tank

11: production tank 13, 15: check valve

17: piston 19: sump

30: tube 31: entrance

33, 34: right exit 35, 36: drain

37-1, -2, -3, -4: Seat portion 50: Operation rod

53-1, -2, -3, -4: locking means 70-1, -2, -3, -4: valve body

75: poppet portion 77: spool portion

79: guide part

Hereinafter, an energy recovery apparatus of a desalination system according to an embodiment of the present invention will be described with reference to the accompanying drawings.

The energy recovery apparatus of the desalination system of the present invention includes a reverse osmosis module 3, a pair of

power recovery chambers

5 and 6, and a flow path switching valve 7, as shown in FIG. It is composed.

Here, the reverse osmosis module 3 is a part for separating seawater into ionic materials and pure water using reverse osmosis, and is connected to the high pressure water tank 9 as schematically shown in FIG. By pressurizing the seawater pumped at a high pressure in the high pressure water tank 9 to the membrane 8 in the module 3, the treated water is produced by removing salts and the like in the seawater by reverse osmosis. At this time, the produced treated water is transferred to the production tank (11) and used for various purposes such as drinking water, and the seawater used for production of juicing water is concentrated water under high pressure and a pair of power recovery chambers (7) through the flow path switching valve (7). 5,6).

The pair of power recovery chambers (5,6) is a low pressure before sending the pressure energy of the high-pressure concentrate remaining in the reverse osmosis module 3 by the membrane (8) to the high-pressure water tank (9) As a part for recovering the pressure energy is delivered to the raw water, as shown in Figure 2, between the reverse osmosis module 3 and the high pressure water tank (9), that is, the flow path switching valve (7) and high pressure water tank (9) is installed between.

Accordingly, the

power recovery chambers

5 and 6 are arranged side by side with each inlet pipe 12 connected to the

outlets

33 and 34 of the flow path switching valve 7, and the inlet pipes at the opposite ends of the outlet pipe 14. 12) is connected to the high pressure water tank (9). At this time, the low pressure water tank 10 is connected to the outlet pipe 14 through the branch pipe 16, respectively, and the low-pressure pumped seawater is supplied to the respective

power recovery chambers

5 and 6 through the outlet pipe 14. It is supposed to be. In addition, each of the

chambers

5 and 6 is equipped with a piston 17 acting as a partition, so that the high pressure concentrated water entering through the inlet pipe 12 and the low pressure source water entering through the outlet pipe 14 do not mix with each other. High pressure can be given and received. In addition, the outlet pipe 14 has a check valve 13 to allow the seawater contained in the pair of

power recovery chambers

5 and 6 to pass only in the direction in which the high pressure water tank 9 is discharged. 16 is provided with check valves 15 which allow the seawater of the low pressure water tank 10 to pass only in the direction to be supplied to the pair of

power recovery chambers

5 and 6, respectively.

The flow path switching valve 7 is a direction switching means for alternately supplying the high pressure concentrated water discharged from the reverse osmosis module 3 to each of the pair of

power recovery chambers

5 and 6 as described above. 3 to 9, the bar is installed between the reverse osmosis module 3 and the pair of

power recovery chambers

5 and 6, again, the tubular body 30, the actuating rod 50, and the valve body. (70-1,70-2,70-3,70-4).

Here, the tubular body 30 is a portion forming the body of the flow path switching valve, and has a long tube shape, and as shown in FIG. 3 or less, at least one inlet 31 in the center, each inlet 31. Two or

more outlets

33 and 34, one on each side of the opening, and drain

openings

35 and 36 on both sides of the opening, respectively. At this time, the inlet 31 is connected to the reverse osmosis module (3) as shown in Figure 2 to 9 to supply the concentrated water of the high pressure to the inside of the tubular body 30, at least one as necessary It may be provided. In addition, at least two

outlets

33 and 34 are opened at opposite sides of the inlet 31 of the tubular body 30 so that the high pressure concentrated water in the tubular body 30 can be discharged to the valve body 70-1, 70-2, 70-. According to the operation of 3,70-4, one of the

power recovery chambers

5, 6 is selected and discharged alternately. On the contrary, the drainage holes 35 and 36 discharge the low pressure source water flowing from either of the

power recovery chambers

5 and 6 through the

outlets

33 and 34, for example, from the chamber 6 of FIG. It is made to drain to the drain tank 19 through. In addition, the tubular body 30 may have each inlet 31,

outlet

33, 34, or other inlet 31,

outlet

33, 34 adjacent to the drainage holes 35, 36 formed through the body as described above. The seat portions 37-1, 37-2, 37-3, 37-4 protrude on the inner circumferential surface between the drainage holes 35, 36, respectively, to provide a plurality of valve bodies 70-1, 70-2, 70-. 3,70-4) together with the high-pressure concentrated water or low-pressure source water to control the flow of the flow, the cover block 39 through which the operating rod 50 is inserted is closed at both ends.

The actuating rod 50 is reciprocated in the axial direction in the tubular body 30 by an actuator connected to the outside, so that the flow path switching valve is driven by the valve body 70-1, 70-2, 70-3, 70-4. As a part for controlling the flow path of 7), as shown in Figures 2 to 9 is mounted coaxially in the tubular body 30, one end is exposed to the outside of the tubular body 30 in a fluid sealed state and connected to the actuator The reciprocating movement forward and backward in the axial direction in the tubular body 30, for this purpose is supported so as to be able to slide in a state of maintaining the watertight through the cover block 39 coupled to both ends of the tubular body 30.

In addition, the operation rod 50 includes a plurality of locking means 53 such as a stopper on the outer circumferential surface to press and move the plurality of valve bodies 70-1, 70-2, 70-3, 70-4 fitted on the outer circumferential surface. -1,53-2,53-3,53-4 are protruded to be spaced apart from each other, as shown in Figure 3, the suction catching means between the inlet 31 of the tubular body 30 Corresponding suction on the left side of the suction seat portions 37-1, 37-2 with the suction catching means 53-1 on the left side of the drawing (53-1, 53-2) between the inlets 31. When the corresponding suction valve element 70-1 on the left side of the inlet 31 is pressed and seated by the seat portion 37-1, the suction catch on the right side of the suction catching means 53-1, 53-2. The means 53-2 is provided with the corresponding suction seat portion 37- with the corresponding suction valve body 70-2 on the right side of the inlet 31 by the pressure of the high pressure concentrated water flowing through the inlet 31. 2 is formed in a position that does not cause interference so that it can be spaced apart from, and the outlet 33, The drainage catching means 53-3 located at the left end of the tubular body 30 among the drainage catching means 53-3 and 53-4 between the 34 and the

drains

35 and 36 has a left outlet 33 and a left side. The corresponding left end drain valve body 70-3 is formed at a position that can be pressurized so as to be spaced apart from the corresponding left end drain seat portion 37-3 located between the drain holes 35, The right end drainage catching means 53-4 has a corresponding right end drain seat 37-4 in which a corresponding right end drain valve body 70-4 is located between the right outlet 34 and the right drain port 36. It is formed in a position that does not cause interference so that it can be seated on the.

At this time, in particular, as shown in FIG. 4, the left drain catching means 53-3 is a left drain valve before the left suction valve body 70-1 is spaced apart from the corresponding left suction seat portion 37-1. The left drain valve is formed in a position such that the sieve 70-3 is sealed to the corresponding left drain seat portion 37-3 and before the inlet 31 and the left outlet 33 are fluidly connected as shown in FIG. The sieve 70-3 is first brought into close contact with the left drain sheet portion 37-3.

In addition, as shown in FIG. 6, the right end drain catching means 53-4 has a right suction seat portion corresponding to the right suction valve body 70-2 to which the right suction catching means 53-2 corresponds. After being in close contact with 37-2, the corresponding right drain valve body 70-4 is formed at a position to be spaced apart from the corresponding right drain seat portion 37-4.

To this end, the right intake valve body 53-2 has a right side before the drainage catching means 53-4 at the right end separates the right drain valve body 70-4 from the right drain seat 37-4. After being in close contact with the suction seat 37-2, the right suction seat until the right drain catching means 53-4 separates the right drain valve body 70-4 from the right drain seat 37-4. The inlet 31 to the right drain 36 while the right drain valve body 70-4 is spaced apart from the right drain seat 37-4. The flow continues to break.

Similarly, as shown in FIG. 7, the actuating rod 50 is the suction catching means 53 on the right side of the suction catching means 53-1 and 53-2 sandwiching the inlet 31 of the tubular body 30. -2) the corresponding suction valve element on the right side of the inlet 31 to the corresponding suction seat portion 37-2 on the right side of the suction seat portions 37-1, 37-2 with the inlet 31 interposed therebetween. When the 70-2 is pressurized and seated, the suction catching means 53-1 on the left side of the suction catching means 53-1, 53-2 is the pressure of the high pressure concentrated water introduced through the inlet 31. Is formed at a position which does not cause interference so that the corresponding suction valve body 70-1 on the left side of the inlet 31 can be separated from the corresponding suction seat portion 37-1 on the left side, and the outlet 33 The drainage catching means 53-4 located at the right end of the tubular body 30 among the drainage catching means 53-3 and 53-4 between the drain 34 and the

drains

35 and 36 are formed at the right outlet 34. Corresponding right end drain sheet portion 37-4 located between the right drain port 36 ) And the corresponding right end drain valve body 70-4 is formed at a position capable of being pressurized so as to be spaced apart from each other, and the left end drain catching means 53-3 of the tubular body 30 has a left end drain valve body 70. -3) is formed at a position which does not cause interference so that it can be seated on the left end drain sheet portion 37-3 located between the left outlet 33 and the left drain port 35.

Also in this case, as shown in FIG. 8, the right drain catching means 53-4 is drained from the right drain before the right suction valve body 70-2 is separated from the corresponding right suction seat portion 37-2. The valve body 70-4 is formed at a position to be sealed to the corresponding right drain seat portion 37-4 so that the right drain before the inlet 31 and the right outlet 34 are fluidly connected as shown in FIG. The valve body 70-4 is first brought into close contact with the right drain seat portion 37-4.

In addition, as shown in FIG. 9, the left end drain catching means 53-3 includes a left suction seat part corresponding to the left suction valve body 70-1 to which the left suction catching means 53-1 corresponds. After being in close contact with 37-1, the corresponding left drain valve body 70-3 is formed at a position to be spaced apart from the corresponding left drain seat portion 37-3.

To this end, the left intake valve body 70-1 is left-sided before the left end drain catching means 53-3 separates the left drain valve body 70-3 from the left drain seat 37-3. After being in close contact with the suction seat 37-1, the left suction seat until the left drain catching means 53-3 has spaced apart the left drain valve body 70-3 from the left drain seat 37-3. The inlet 31 to the left drain 35 while the left drain valve body 70-3 is spaced apart from the left drain seat 37-3. The flow continues to break.

The plurality of valve bodies 70-1, 70-2, 70-3, and 70-4 are movably mounted on the outer circumferential surface of the actuating rod 50, and the

outlets

33, 34 are provided by the actuating rod 50. And means for causing the flow paths to the

drains

35 and 36 to selectively open and close crosswise, and each latching means so as to have a one-to-one correspondence toward the respective seat portions 37-1, 37-2, 37-3, 37-4. 53-1,53-2,53-3,53-4).

At this time, the suction valve body 70-1, 70-2 located between the inlet 31 and the

outlet

33, 34 of the valve body 70-1, 70-2, 70-3, 70-4 is As shown in FIGS. 3 to 9, an axially movable insertion between the corresponding suction catching means 37-1, 37-2 and the inlet 31 on the actuating rod 50 is performed at the inlet 31. Although it may operate in close contact with each corresponding suction catching means 37-1, 37-2 by the pressure of the incoming high pressure concentrated water, as shown in FIG. 11, each corresponding suction catching means It is also possible to reciprocate from side to side with the working rod 50 in a state of being fixed by a fastening means such as a bolt 38 on the surface facing the inlet 31 of (37-1, 37-2).

The intake valve body 70-1, 70-2 is also made up of a poppet portion 75, a spool portion 77, and a guide portion 79, as shown in FIG. 11. ) Is a cylindrical body fixed coaxially to the actuating rod 50, the outer diameter of which is larger than the inner diameter of the left and right suction sheet portions 37-1 and 37-2, as shown in FIG. End faces facing each other toward −1,37-2 are inclined, and the left and right suction sheet parts 37-1 and 37 are in close contact with the inclined surfaces formed at the edges of the left and right suction sheet parts 37-1 and 37-2. -2) Finally, the flow path formed through the sealing is blocked.

In addition, the spool portion 77 is a portion for allowing the suction valve body 70-1, 70-2 to maintain the close contact with the left and right suction seats 37-1, 37-2, that is, the close time. As shown in FIG. 11, the poppet part 75 protrudes coaxially toward the left and right suction seats 37-1 and 37-2, respectively, as shown in FIGS. 6 and 9. The left and right suction seat portions 37 before the means 53-3, 53-4 separate the left and right drain valve bodies 70-3, 70-4 from the left and right drain sheet portions 37-3, 37-4, respectively. Secure enough length to allow close contact with -1,37-2).

Finally, the guide portion 79 is a portion that allows the intake valve body 70-1, 70-2 to maintain the insertion state in the left and right suction seat portions 37-1, 37-2 even in the maximum opening position. As shown in FIG. 11, the ends of the spool portion 77 extend coaxially toward the left and right suction sheet portions (,), and as shown in the drawing, the radially protruding radial portions protrude radially from each other. While maintaining the insertion state of 37-1, 37-2, it is also possible to maintain the flow of the high pressure concentrated water through the intake valve body (70-1, 70-2) above a certain level.

Now, the operation of the energy recovery device 1 of the desalination system of the present invention configured as described above is as follows.

The energy recovery device 1 of the present invention supplies the high pressure concentrated water discharged from the reverse osmosis module 3 to the power recovery chamber 5 on the right side through the flow path switching valve 7 at the position shown in FIG. 2. In addition, the high pressure concentrated water supplied to the power recovery chamber 5 strongly presses the piston 17 and moves to the downstream side. Accordingly, the low pressure source water in the chamber 5 is pressurized to high pressure through the piston 17 and is supplied to the high pressure water tank 9 through the check valve 13 in the outlet pipe 14. At the same time, since the flow path switching valve 7 opens to the drain 19, the low pressure source water of the low pressure water tank 10 passes through the check valve 13 and the left power recovery chamber 6 through the branch pipe 16. Is supplied.

At this time, the flow path switching valve 7 as shown in Figures 2 and 3, the operating rod 50 is in the right-side point, the intake valve body 70-1 of the left side of the inlet 31 is the left suction locking means Since it is pressurized by 53-1 and in close contact with the left suction sheet portion 37-1 at the rightmost position, the flow path leading from the inlet 31 to the left outlet 33 is blocked. At the same time, since the suction catching means 53-2 on the right side of the inlet 31 is sufficiently separated from the inlet 31 on the right seat portion 37-2 to the right, the suction valve body 70-2 on the right side of the inlet 31. Is pushed open until it is caught by the right suction catching means 53-2 by the pressure of the high pressure concentrated water flowing from the inlet 31. Accordingly, the flow path from the inlet 31 to the right outlet 34 is connected, and the working fluid introduced into the inlet 31 is discharged to the right power recovery chamber 5 through the right outlet 34. At this time, the left end drain valve body 70-3 is pushed by the left end drain catching means 53-3 to fall off the left end drain seat portion 37-3, whereby the left outlet 33 is left drain port ( 35) to drain the low pressure source water introduced into the left power recovery chamber (5), as well as the low pressure source water received at the left end of the tubular body (30). In addition, the drain valve body 70-4 at the right end is pressurized to the right end by the pressure of the high pressure condensate flowing into the inlet 31, and the right outlet 34 is in close contact with the right end drain seat 37-4. ) And the right drain 36 is cut off.

In this state, when the actuating rod 50 is moved to the left by the actuator, as shown in FIG. 4, the left end drain catching means 53-3 first enters the left end drain seat 37-3, Before the left intake valve element 70-1 is spaced apart from the left intake seat portion 37-1, the left drain valve element 70-3 is released by the friction force with the actuating rod 50 or in the tubular body 30. It reaches the left drain seat part 37-3 by the physical force, and blocks the flow between the outlet 33 and the drain hole 35. At this time, the left suction valve body 70-1 and the right end drain valve body 70-4 maintain their close contact with the left suction seat unit 37-1 and the right end drain seat unit 37-4, respectively. On the other hand, since the right suction valve body 70-2 remains in an open state before the spool portion is in close contact with the right suction seat portion 37-2, the fluid connection between the inlet 31 and the right outlet 34 is continued. do.

In this state, when the operation rod 50 again moves to the left side, as shown in FIG. 5, the flow path switching valve 7 is placed in the neutral section. At this time, the left suction locking means 53-1 moves to the left so that the spool portion of the left suction valve body 70-1 is spaced apart from the left suction seat portion 37-1, while the left and right end drain valve body 70- 3, 70-4 is strongly adhered to the left and right end drain seat portions 37-3, 37-4 by the high pressure concentrated water, and the right suction valve body 70-2 has the spool portion of the right suction seat portion ( 37-2), the high pressure concentrated water flowing from the inlet 31 is divided into the left and

right outlets

33 and 34 and discharged. In this way, the high pressure concentrated water is divided into two

chambers

5 and 6, and the speed of the piston 17 in the

chambers

5 and 6 is reduced, and thus, the sudden change of the fluid is suppressed, so that the water shock phenomenon can be reduced. do.

Subsequently, when the operation rod 50 moves to the left side, as shown in FIG. 6, the right suction valve body 70-2 is pushed to the left side by the right suction catching means 53-2, and accordingly, the right side The right intake valve body 70-2 is immediately spooled from the right end drain valve body 70-4 pushed by the end drain catching means 53-4 from the right end drain seat 37-4. The close contact with the right suction seat 37-2 blocks the fluid connection between the inlet 31 and the right outlet 34.

Next, when the operation rod 50 moves further to the left to reach the left dead center, as shown in FIG. 7, the right suction valve body 70-2 pushed to the left by the right suction catching means 53-2. ) Is in close contact with the right suction seat portion 37-2 by the spool portion, thereby first blocking the fluid connection between the inlet 31 and the right outlet 34. Then, the right end drain catching means 53-4 finally presses the right end drain valve body 70-4 to the left to be spaced apart from the right end drain seat 53-4 with the right outlet 34. The flow between the right end drain 36 is connected. Accordingly, the high pressure concentrated water flowing from the inlet 31 is discharged to the left power recovery chamber 6 through the left outlet 33 to pressurize the low pressure source water in the chamber 6 to a high pressure to supply the high pressure water tank 9. To be discharged. On the other hand, as the high-pressure concentrated water of the right power recovery chamber (5) and the right side of the tubular body (30) is discharged to the drain tank (19) through the right end drain (36), the right power recovery chamber (5) is a low pressure source tank (10). It is filled with low pressure source water supplied from.

At this time, the left end drain valve body 70-3 is strongly adhered to the left end drain seat 37-3 by a high pressure concentrated water that has passed through the guide part of the left suction valve body 70-1, and thus the left end drain port 70 35) Prevent leakage of high pressure concentrate into the furnace. Further, due to the long spool portion of the right intake valve body 70-2, the flow paths of the inlet 31 and the right end drain 36 are first blocked, and then the flow path of the right end drain 36 and the right outlet 34 is Since it is open, the high pressure concentrated water flowing from the inlet 31 can be prevented from directly exiting the right drain 36.

On the contrary, when the operating rod 50 moves to the right as shown in FIG. 8 at the left dead center of FIG. 7, the spool portion of the right suction valve body 70-2 is the right suction seat portion as shown in FIG. 4. The right end drain valve body 70-4 is in close contact with the right end drain seat 37-4 before the flow paths of the inlet 31 and the right outlet 34 are spaced apart from 37-2. The flow path between the 34 and the right end drain 36 is first closed.

Subsequently, when the actuating rod 50 moves to the right, the flow path switching valve 7 passes through the neutral section shown in FIG. 5 by opening the right intake valve body 70-2 by moving to the right. It will be in the state shown in FIG. In this state, the flow path switching valve 7 is left intake valve element 70- before the left end drain valve element 70-3 is spaced apart from the left end drain seat portion 37-3 in the same manner as shown in FIG. 1) first blocks the flow path leading from the inlet 31 to the left outlet 33 so that the high-pressure concentrated water flowing from the inlet 31 immediately opens through the left end drain 35 when the left end drain 35 is opened. It is possible to prevent the discharge.

Therefore, according to the energy recovery apparatus of the desalination system using the reverse osmosis pressure of the present invention, the valve body of the flow path switching valve used to recover the pressure energy of the high pressure concentrated water is connected to one working rod and one actuator connected to the working rod. Operation is possible, which can significantly reduce the cost of equipment, maintenance or operation according to the valve object.

In addition, since the suction valve body has a poppet structure having an inclined surface and a spool structure extending the sealing contact time by the sliding contact surface, the high pressure concentrated water discharged from the reverse osmosis module is not directly drained to the drain tank during valve opening and closing. It is possible to prevent the high pressure concentrated water from leaking inside the pipe, thereby minimizing the loss of pressure energy of the high pressure concentrated water, thereby maximizing the energy recovery rate.

Claims

A reverse osmosis module for separating a portion of seawater supplied at a high pressure from a high pressure water tank into an ionic substance and pure water by a membrane to produce treated water from which salt is removed;

Is installed between the reverse osmosis module and the high pressure water tank, the at least one pair of the pressure of the remaining high pressure concentrated water reverse osmosis in the reverse osmosis module is transmitted to the low pressure seawater supplied from the low pressure water tank to the high pressure water tank Power recovery chamber; And

And a flow path switching valve installed between the reverse osmosis module and the power recovery chamber to alternately supply the high pressure concentrated water discharged from the reverse osmosis module to each of the power recovery chambers.

The flow path switching valve,

At least one inlet connected to the high pressure fluid source to allow the high pressure fluid to enter therein, at least one pair of outlets each formed at each side of the inlet so that the fluids flow out alternately, and formed at both ends to be At least one pair of drains each of which alternately drains the fluids is formed, and between the inlets, outlets, and drains adjacent to each other on the inner circumferential surface of the pipe body, each of which has a suction or drain sheet projecting;

An actuating rod mounted in the tubular body so as to be able to move back and forth in the axial direction by an actuating means, the actuating rod having a suction or drainage catching means protruding one-to-one on the outer circumferential surface thereof; And

And a plurality of suction or drain valve bodies mounted on an outer circumferential surface of the working rod and configured to control the flow of the fluid through the seat portions by repeating detachment with the seat portions corresponding to the one-to-one correspondence. Energy recovery device of desalination system using osmotic pressure.
The method of claim 1,

Any one of the suction catching means having the inlet interposed therebetween corresponds to one of the suction seats with the inlet interposed between any one of the suction valve bodies having the inlet interposed therebetween. In close contact with one seat portion to cut off the flow from the inlet to the either inlet and the corresponding outlet,

The other suction catching means is formed at a position to connect the flow from the inlet to the other outlet by separating the corresponding other suction valve body from the corresponding other suction seat portion,

Any one of the drainage catching means between the outlet and the drainage port is any one of the drainage valve portion between the outlet and the drainage port corresponding to any one of the drainage seat portion between the outlet and the drainage port. Spaced apart from the seat portion so as to connect the flow from the corresponding one outlet to the corresponding one of the drains,

The other drainage catching means is in close contact with the corresponding other drain valve body to the corresponding other drain seat so that the flow from the other outlet to the corresponding other drain is cut off. Energy recovery device of the desalination system using reverse osmosis, characterized in that formed in the position.
The method of claim 2,

The other drainage catching means is positioned such that the other drainage valve body is in close contact with the corresponding other drainage seat portion before the other intake valve body is spaced apart from the corresponding other suction seat portion. Energy recovery device of the desalination system using reverse osmosis, characterized in that formed.
The method of claim 2,

The one of the drain catching means closes the corresponding one of the drain valve bodies after the one of the suction catching means is brought into close contact with one of the corresponding suction seats. Is formed in a position to be spaced apart from the corresponding one of the drain sheet,

The said one suction valve body is in close contact with said one suction seat part before said one drainage latching means separates the said one drain valve body from the said one drain seat part, An energy recovery apparatus of the desalination system, characterized in that the flow is continuously cut from the inlet to the one drain while the one side drain valve body is separated from the one drain seat.
The method according to any one of claims 2 to 4,

And each said suction valve body is fixed on a surface facing said inlet of said respective said suction catching means.
The method according to any one of claims 2 to 4,

The suction valve body,

A poppet portion fixed coaxially to the actuating rod, the poppet portion having an outer diameter greater than an inner diameter of the suction seat portion;

A spool portion protruding from the poppet portion toward the suction seat portion, the spool portion being secured to a length sufficient to be in close contact with the suction seat portion before the drainage catching means is spaced apart from the drainage seat portion; And

And a guide portion protruding radially from the spool portion at a predetermined interval from the suction sheet portion to maintain the insertion state in the suction sheet portion even at the maximum opening position. Energy recovery system of the system.